2. 公务员
  3. Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】_____

Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】_____

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问题     Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】______. Yet, all living things still show the【C2】______of aging, which will eventually【C3】______death.
    Aging is not a disease, but as a person passes maturity(成熟期), the cells of the body and the 【C4】______they form do not function as well as they【C5】______in childhood and teenage years. The body provides less【C6】______against disease and is more【C7】______to have accident.
    A number of related causes may【C8】______aging. Some cells of the body have a fairly long life, but they are not【C9】______when they die. As a person ages, 【C10】______of brain cells and muscle cells decreases. 【C11】______body cells die and are replaced by new cells. In an aging person the【C12】______cells may not be as workable or as capable【C13】______growth as those of a young person.
    Another【C14】______in aging may be changes within the cells【C15】______. Some of the protein chemicals in cells are known【C16】______with age and become less elastic(有弹性的). This is why the skin of old people wrinkles(皱纹) and【C17】______. This is also the reason why old people 【C18】______in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and【C19】______information that the cells need. Aging may affect this【C20】______and change the information – carrying molecules so that they do not transmit the information as well.
【C10】
选项 A、a number
B、the amount
C、the number
D、a great deal
答案C
解析 根据此句的谓语动词decreases可确定其主语应为the number，表示“……的数量”，作主语时，应该使用单数的谓语动词；a number of“许多、大量”常用来修饰复数名词，做主语时，要使用复数谓语动词；the amount of“……的数量是”，常接不可数名词；a great deal of“大量的”，后接不可数名词。
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